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International Conference on Electric technology and Civil Engineering

作者： Zheng, Xiaoyan Xu, Yue Feng, Zhuode Key Laboratory of Bridge Detection and Reinforcement Technology Ministry of Communication Chang'An University Xi'an China School of Transportation Engineering Hefei University of Technology Hefei China China Communication Construction Highway Consultants CO. Ltd CCCC Highway Consultants CO. Ltd Beijing China

ISBN: (纸本)9781457702907

Long-span multi-tower suspension, a new bridge system, is more adaptable to such geography condition as straits and bays, so the static wind load can not be ignored in the design and construction. As well as, the origin of performance difference between multi-tower suspension bridge and the traditional one is the existence of center towers. Therefore, property change of multi-tower suspension bridge with the increase of tower number under the action of static wind is concerned in this paper. A three-tower suspension bridge is used as project reference, and finite element models of suspension bridge by the Midas/Civil platform, which the main span is longer than one kilometer and towers count from two to seven, are established to analysis the structure performance under static wind action. The mechanics effect of multi-tower suspension and its lateral stiffness difference are paid attention to. The results show that, because of the constraints of the center towers, stiffening girder of multi-tower suspension bridge has a more reasonable stress condition than that of traditional suspension bridge under the action of horizontal load. And, the number of bridge towers has little effect on lateral stiffness of suspension bridge. © 2011 IEEE.

关键词： Suspension bridges

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Analysis of mechanism of semi-circular transverse cracks in light double column bridge piers

Analysis of mechanism of semi-circular transverse cracks in ...

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International Conference on Mechanic Automation and Control Engineering (MACE)

作者： Xiaoxing Zhao Gang Zhang Bo Yuan Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang an University Xi'an China Chang an University Xi'an China

The reasons of semi-circular transverse cracks of the bridge piers are analyzed in the paper. A lot of semi-circular transverse cracks occurred in the top of 1# and 2# bridge piers before the open to traffic. In the loading process of the load test, the cracks show the trend of expansion. The formation causes of these cracks are analyzed from aspects of the material, environment temperature, construction methods and imposed load and the finite element software ANSYS is further used to conduct the local stress analysis of the 1# and 2# bridge piers. It is found that the main reason leading to the transverse cracks on the top of 1# and 2# bridge piers caused by the active earth pressure on the two bridge piers generated by the asymmetry landfill. Recommendation: If the bridge piers in an inclined plane, the bulldozers should be avoided piled up around the piers, if unavoidable, should ensure that the bulldozers on both sides of the piers generated balance active earth pressure in order to avoid similar incidents.

关键词： bridges Structural beams Concrete Finite element methods Earth Transportation Laboratories

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Research in effective temperature difference of concrete box girder bridge

Research in effective temperature difference of concrete box...

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International Conference on Electric technology and Civil Engineering (ICETCE)

作者： Xiao Lei Hanwan Jiang Bohai Ji Shoushan Cheng College of Civil and Transportation Engineering Hohai University Nanjing China Key Laboratory of Bridge Detection & Reinforcement Technology Research Institute of Highway MOT China

The temperature data of a post-tensioned continuous concrete box-girder bridge have been monitored for five years. Based on the measured data, the temperature in the different positions of the concrete box girder was systemically analyzed to extract the effective temperature. A method for predicting the extremum value of the effective temperature of concrete box girder was proposed by use of the extrema analysis and curve fitting based on the temperature in the different positions of the concrete box girder. The coefficient of determination of the effective temperature curve is 0.9619. Then the effective temperatures of the box girder in different months were developed. The relationship is quite useful in estimating the effective temperature difference in concrete box-girder.

关键词： Temperature measurement Concrete bridges Structural beams Temperature sensors Temperature distribution Monitoring

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Research in effective temperature difference of concrete box girder bridge

Research in effective temperature difference of concrete box...

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International Conference on Electric technology and Civil Engineering

作者： Lei, Xiao Jiang, Hanwan Ji, Bohai Cheng, Shoushan College of Civil and Transportation Engineering Hohai University Nanjing China Key Laboratory of Bridge Detection and Reinforcement Technology Research Institute of Highway MOT Beijing China

ISBN: (纸本)9781457702907

The temperature data of a post-tensioned continuous concrete box-girder bridge have been monitored for five years. Based on the measured data, the temperature in the different positions of the concrete box girder was systemically analyzed to extract the effective temperature. A method for predicting the extremum value of the effective temperature of concrete box-girder was proposed by use of the extrema analysis and curve fitting based on the temperature in the different positions of the concrete box girder. The coefficient of determination of the effective temperature curve is 0.9619. Then the effective temperatures of the box girder in different months were developed. The relationship is quite useful in estimating the effective temperature difference in concrete box-girder. © 2011 IEEE.

关键词： Temperature

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Overview of bridge structure damage criterion under seismic action

Overview of bridge structure damage criterion under seismic ...

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2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011

作者： Zhao, Xiaoxing Zhang, Yue Key Laboratory for Old Bridge Detection and Reinforcement Technology Ministry of Transportation Chang' An University Xi'an China School of Construction and Civil Engineering Xi'an University of Science and Technology Xi'an China

ISBN: (纸本)9781424494392

In order to reduce bridge project under the effects of earthquake damage, it is necessary to bridge structure under earthquake effect of performance evaluation and comparison, this one of the main thing is that the failure criterion determination. So far, domestic and foreign scholars have made numerous earthquake Failure Criteria for bridge structure, which have a wider application based on the ductile deformation, strength and energy-based guidelines and parameters of energy and ductile deformation of the destruction of two-parameter Failure criteria. This paper makes a summary of the criteria's history and merits. © 2011 IEEE.

关键词： Earthquakes

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Overview of bridge structure damage criterion under seismic action

Overview of bridge structure damage criterion under seismic ...

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International Conference on Mechanic Automation and Control Engineering (MACE)

作者： Xiaoxing Zhao Yue Zhang Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang an University Xi'an China School of Construction and Civil Engineering Xi''an University of Science and Technology Xi'an China

ISBN: (纸本)9781424494361

关键词： bridges Earthquakes Concrete Guidelines Vibrations Transportation

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The analysis model of interaction of piles-soil-bridge for elevated pile foundation

The analysis model of interaction of piles-soil-bridge for e...

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International Conference on Electric technology and Civil Engineering

作者： Zhou, Mi Zhang, Yue Yuan, Wancheng Key Laboratory for Old Bridge Detection and Reinforcement Technology Ministry of Transportation Chang'An University Xi'an China School of Construction and Civil Engineering xi'An University of Science and Technology Xi'an China State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai China

ISBN: (纸本)9781457702907

the several kinds of pile-soil simplified analysis models were enumerated in the paper. Four analysis models were chose to build the elevated-pile- foundation FEM of a cable-stayed bridge. Then dynamic analysis and push-over analysis were done. The results of dynamic characteristics, pushover curves and form mechanism of the plastic hinges were compared by different simplified models. The truncated model was proposed in the paper because whether anti-push rigidity or plastic-hinge mechanism calculated by this model is most close to prototype. So the paper provided a simplified model for pile group foundation which could simplify calculation and guarantee the calculation precision. Research results can be used for conceptual design of bridges. © 2011 IEEE.

关键词： Piles

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The determination of prestressed concrete covering layer system depth under atmosphere condition

The determination of prestressed concrete covering layer sys...

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International Conference on Electric technology and Civil Engineering (ICETCE)

作者： Feng Chen Dalin Hu Yili Sun Key Laboratory of Bridge Detection & Reinforcement Technology Ministry of Communications (Xian ) Chang'an University Xi'an China

ISBN: (纸本)9781457702891

The prestressed concrete covering layer system, different with the general reinforced concrete cover, is a complex system which includes not only the non-uniform layer of concrete, but also the non-prestressed reinforcement, the metal corrugated pipe and the cement paste incrustation body in the pipe. Therefore, the study for carbonization corrosion of the prestressed concrete structures should consider effect of the stress and deactivated film position of reinforcing bar. Taking into consideration of the effect of stress level in concrete diffusion process, the carbonization reaction and diffusion process in the complete carbonated zone and the half-carbonated one under multi factor is analysed. It presents the durability limit state equation for prestressed concrete structures under carbonization condition, which can determine the depth of the covering layer system for prestressed concrete structures.

关键词： Concrete Stress Corrosion Films Guidelines Laboratories

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Deformation analysis of concrete thin-wall box girders for width and difference exposed to fire

Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of ...

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Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of Science and technology (Natural Science Edition) 2011年第2期12卷 165-171页

作者： Zhang, Gang Key Laboratory of Old Bridge Detection and Reinforcement Technique in Traffic Industry Chang'an University Xi'an 710064 China

To study the deformation problems of the wide and different thin-wall prestressed concrete box girders exposed to fire, the enthalpy conduction model was created. Thermal-mechanical coupled method was applied to the analysis of the deformation of the three-span wide and different thin-wall concrete box girders. Fire and load model of single span was studied. Mid-span transverse deflection of each span during prior periods and anaphase of extending-fire time was analyzed with the variation of the load ratio. The results indicate that the deflection is larger than that of other spans under the condition of fire and load of bias span, and the deflection ratio of the two-side spans is about 20~30;that the deflection of the two bias spans is downwards and the deflection of the mid-span is upward;that under the condition of fire and load of mid-span, the deflection of the three spans basically keep consistent, the deflection of the two-side spans is upward and the deflection of the two mid-span spans is downwards;that the cross-bridge effect of the side span is more obvious than that of the mid-span, and the side rib of the bias span has a upward phenomenon;and that with the increment of the load ratio, the trend of the deflection keeps unchanged, the increment amplitude of fire and load spans is larger while that of the other span is comparatively smaller. In actual engineering, load and fire of the bias span should be avoided because of the disadvantage for the deformation of the structure.

关键词： Fires

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Construction-control technique for PC bridge with cantilever casting method

Construction-control technique for PC bridge with cantilever...

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International Conference on Mechanic Automation and Control Engineering (MACE)

作者： Changmin Li Junwu Niu Mi Zhou Hubei Transportation Department Hubei Engineering Quality Supervision Bureau Wuhan China CCCC First Highway Consultants Company Limited Xi'an China Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University Xi'an China

Adaptive control theory, structural parameter identification and error analysis are used to control the construction of PC cantilever casting bridge in the paper. The construction camber for main beam can be determined by BP artificial neural network. The deflection of main beam should be tested persistently. Strain sensors are previously located in beam to determine the concrete strain. The paper analyze some infection factors of strain test, such as concrete shrinkage, creep, temperature influence, and the strain correction method is proposed. So the stress and deflection of main beam in construction period can be controlled. Practical application approved that adaptive control theory combining with ANN could forecast appropriate camber. The factor of concrete shrinkage and creep could not be ignored on strain test of main beam. Measured value should be corrected to make us obtain objective stress status of structure. The correction method on measured strain which the paper proposed is feasible and accurate.

关键词： bridges Artificial neural networks Strain Structural beams Concrete Road transportation Casting

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